For comparables, see:
"Nello splendore mediceo: papa Leone X a Firenze", p. 170, a relief on display at the Victoria & Albert Museum, London, by a 16th Century sculptor (inv. A-61960); also at p. 476 a terracotta by di Luca della Robbia, at Museo Nazionale di Castel Sant'Angelo a Roma (inv. n. 563/IV).